Pulverizing machine



A. A. HOLBECK ET AL PULVERIZING MACHINE I Oct. 8, 1935.

Filed Oct. 29, 1952 2 Sheets-Sheet l :K 5 w w s 5 NW 5% m N E r W@ A Patented Oct. 1935 UNITED STATES PATENT oFFic-g PULVERIZING' MACHINE Austin A. Holbeck, Lakewood, and Halvor F.

Holbeck, Cleveland, Ohio Application October 29,1932, Serial No. 640,204

* 1 Claim.

, '5 in operation.

Anotherobject of our invention is to provide an improved pulverizing machine, of the multiple zone type, wherein the pulverizing rotors are so arranged that the material is fed to the rotors in succession atthe periphery thereof and passes through each rotor in opposition'to centrifugal force.

A further object of our invention is to provide a pulverizing machine, of the multiple zone type, wherein the pulverizing rotor of each zone is in close running relation to one wall of the zone around a discharge opening therein, and is spaced from the other wall of the zone to provide a passage for feeding the material to be pulverized to the periphery of the rotor, whereby the material passes through the rotors in succession and passes through each-rotor in opposition to centrifugal force.

The invention may be further briefly summarized as consisting in certain novel combinations and arrangements of parts, hereinafter described and particularly set out in the appended claim.

In the accompanying sheets of drawings,

- Fig. 1 is a longitudinal sectional elevation of a pulverizing machine constructed according to our invention;

Fig. 2 is a transverse sectional view thereof taken substantially on line 22 of Fig. 1;

Fig. 3 is a longitudinal sectional view of another pulverizing machine embodying our invention; "-and Fig. 4 is a transverse sectional view thereof taken substantially on line 4-4 of Fig. 3.

Detailed reference will now be made to. the accompanying drawings illustrating preferred forms of they pulverizing apparatus of our invention; Before proceeding with such detailed description it should be understood, however, that our invention is" not to be regarded as limited to The housing maybe of any suitcylindrical top portion l4 and a squared bottom portion |5,-the latter forming .a suitable base; upon which the machineis supported. The housing is provided at one end thereof with a removable cover is, which forms the end wall of the 5' housing, and which is provided with an inlet opening for the material to be pulverized. At its opposite end .the casing is provided with a chamber I8 in which the fan 13 is rotatably housed.

This fan chamber is formed between the end wall 0 IQ of the housing and a partition wall 20 which is spaced inwardly therefrom. The fan chamber is preferably of volute form and is provided with a substantially.tangentially extending discharge nozzle 2| through which the mixture of air and 1-5 pulverized material may be delivered from the machine. I J .{Y

The section of the housing which is located between the end wall l6 and the partition 20 constitutes the grinding compartment which con- 20 tains the grinding zones II and I2. In forming these grinding zones, we provide a hollow cylindrical liner 2i which is mountedin the housing in coaxial relation with the shaft 22 upon which and is preferably provided on its inner surface with teeth or' corrugations 23' which assist in breaking upthe material. A' partition wall 24, preferably formed integral with the liner, divides 30 the interior thereof into the two pulverizing zones l l and I2 which are connected by a circular opening 25 located centrally of the partition walL. The grinding zone I2 is connected with the fan chamber l8 by means of a circular opening 26 located 5 substantially centrally of the partition 20 and in substantial axial alignment with the opening 25 of the partition 24. z v

. The fan shaft 22 extends through the'openings' 28 and 25 and is drivingly connected with pulver- 40 izing rotors 21 and 28 which rotate, respectively, in the grinding zones II and i2. 'The rotor 21 is provided with a hub 29, which is keyed or otherwise suitably connected to the shaft 22, and with a disk portion 30 which is disposedin close running relation with the partition 24; This disk portion is :providedwith .a central opening 3],

' which aligns substantially with the opening 25 of the partition 24, and with a plurality of circumferentlally spaced pulverizlng or crushing -ele- 50 ments 32. These crushing elements, which may also be referred to as impact or attrition elements,

maybe of any suitable form and are here shown as pegs formed integral'with the disk portion 30 around the outer edgethereof and arranged to extend toward the cover It substantially in the direction of the axis of the'shaft 22. L

h For cooperation with the crushing elements of the rotor 21, we provide a circumferentially extending row of spaced crushing elements 33 which are preferably in the form of pegs arranged to extend toward the disk portion of the-rotor 21 just inwardly of the'row of crushing elements 32. The stationary elements 33 extend around the edge of a disk member 34 which may be supported in the housing in any suitable manner, such as by means" of the-brackets. This disk member is arranged in spaced relation to the cover It to form a passage for feeding the material from the inlet I! to the pulverizing rotor 21. With the arrangement as just described, it

be seen that the material supplied to the housing through-the inlet opening 11- is fed tothe rotor 21 through annular space 36 which extends around between the outer periphery of =the rotor and the corrugated inner surface of the liner 2 l -The material entering this space is struck by the elements. 32 and is-thrown back and forth between these elements and the corrugated inner liner which causes the material to be broken and crushed. If desired, the crushing action to which the material is subjected maybe increased by enlargin'g someof the elements 32t'o form hammers which extend outwardly in closer relation to the corrugated inner liner, as shown in Fig. 2. The

, material passing inwardly through the spaces crushing zonel2, is provided with a hub 31'. which is keyed or otherwise secured to the .shaft 22.-

This rotor is also provided with a disk portion 38 having at the outer edge thereof, a plurality of pulverizing or crushing elements in the form of .circumferentially spaced pegs 39 which extend axially of the housing around the discharge opening 26 of the partition 20. These elementsoverlap, and cooperate with, circumferentially spaced stationary crushing elements or pegs 40 which are mounted on this partition around the opening 23.

According to our invention, the disk portion 38 of this pulverizing rotor is spaced from the partition24 to provide a substantially unobstructed passage 4| therebetween, which passage connects the discharge opening 25 of the zone u with an annular space 42 extending around between the rotor 28 and the inner surface or; the liner 2l',. The material delivered from the first grinding zone enters the annular space 42 through the pasv sage 4| and fromthe annular space is fed inwardly into the second pulverizing rotor. The stream 7 of air, created by the fan l3, causes the material to flow through the passage 4| and into the an-'- nular passage 42 where the material is subjected to a further crushing action between the elements 33 and the corrugated inner surface of the liner.

This flojw of air also causes the material-to move inwardly through-the spaces between the crushing elements of the rotor, in opposition to centrifugal force, so that this material is subjected to a further crushing action bylthe cooperation of 'the crushing elements of the rotor with the stationary crushingelements 40. By reason of the action of centrifugal force on the larger particles, only the finely pulverized material is drawn into the fan chamber through the opening 26. This finely pulverized material is delivered from .the machine, with the stream of air, through the delivery nozzle 2 l a p The fan l3 and the pulverizing rotors 21' and 28 may be actuated by any suitable means, for ex- 10 ample, the shaft 22 may be conveniently'driven by a suitable motor, such as the electric motor 43. If desired, the housing of the machine may be provided with .a suitable bracket, such as the ill tegral extension 44, which forms a convenient 15 mounting for the'electric motor. In crushing apparatus of this kind it is usually desirable-that hard foreign bodies, such as tramp iron, be removed from the material to be crushed, so as to prevent injury to the pulverizing rotors 20 and liner. and, to this end, we construct the housa ing of themachine with a pocket or chamber 45 outwardly of the liner 2|, which pocket is connected with the lower-end of the inlet opening i 1- by-means of the passage 46. The heavyforei particles entering the housing with the mater l to be pulverized, settle to the bottom of the inlet passage and find their way into the pocket 45 through the passage 46. The material thus collected in the pocket 45 may be removed, from 301 time to'time, through a suitable opening provided in the housing for that purpose.

f In Figs. 3 and 4 of the drawings, we have shown another pulverizing machine, which is construct ed according to our invention, and which is pro 36' vided with a housing 48 having pulverizing zones 99 and 50 therein and a fan chamber 5| from which the pulverized material is delivered through the tang'ential'delivery nozzle 52. The housing 'is provided atone end thereof with a removable 40 cover 53 having an inlet opening 54, through which material tobe pulverized may be fed, and through whichair is drawn by rotation of the fan 55 in the fan chamber 5|.

To form the pulverizing zones 49 and 50, we 4 provide the housing with a substantially cylindrical liner 56, having an integral partition wall 51 between the pulverizing zones. This liner may beretained in place in the housing by means of the removable cover 53. Pulverizing rotors 5 58 and operate in the pulverizing zones 49 and 50, and are connected to a drive shaft 30, to which the fan 55 is also connected. This shaft extends longitudinally of the housing and may be driven by any suitable power means, such as 55 the electric motor 6|. The partition wall 51 is provided with'a centralvopening 62 around the shaft 60, which opening connects the pulverizing zone 49 with the pulverizing zone 50. A similar opening 63 is formed in the" partition wall 64, which is located between the pulverizing zone 50 and the fan chamber 5|, such opening providing a discharge passage for the delivery of pulverized material from the pulverizing zone 50 to the fan chamber; o v 65 'According to our invention, the pulverizing rotor 58 is disposed in close. running relation to the partition 51 around the opening 62 provided in this parti. ion. This rotor is preferably in the form of a hollow structure having spaced disk 7 and ring portions '65 and 66, and also having a plurality of circumfere'ntially spaced axially extending crushing elements 61 disposed between these members at the outer edge thereof. The ring member 66 is in close running relation to the partition 51 and is provided with a central opening 68 which registers with the opening 62 of the partition. The disk portion 65 is drivingly connected with the shaft 60 and is spaced from the cover 53 to provide a passage 69 for feeding the material to the rotor from the inlet opening 54. The material in the passage 69 is fed to the rotor through the annular space 10 extending between the crushing elements 61 and the corrugated inner'surface 'H of the liner 56. The material entering this space is subjected to a crushing action between the element 61 and the liner until the material is rendered sufiiciently fine to be drawn in through the rotor, in opposition to centrifugal force, by the flow of air created by the fan 55.

The pulverizing rotor 59, which operates in the pulverizing zone 50, is disposed in close running relation with the partition 64 so that the material which is delivered to the fan chamber through the passage 63 must first pass through this pulverizing rotor. The rotor itself comprises disk and ring portions 12 and I3, and a plurality of circumferentially spaced crush ng elements 14 extending between the disk and ring portions around their outer edge. The ring portion 13 is in close running relation to the partition 64 and is provided with a central open'ng 15 which registers substantially with the opening 63 leading into the fan. chamber. The disk portion 12 is drivingly connected with the shaft 60 and is spaced from the parttion wall 51 to provide a passage 16 for feeding material to the rotor. As shown in Fig. 3, the passage I6 connects the opening 82 of the partition 51 with the annular space 'II extending around between the crushing elements 14 and the corrugated inner surface of the liner to. so that material delivered from the pulverins rotor it will be suppl'ed to the pulverizing rotor 59. The material being supplied to the rotor 59 enters the annular space H and is subjected to a crushing action between the elements 14 and the corru-' gated liner, and when this material has been rendered sufiicientiy fine, it is drawn in through the spaces between-the crushing elements II. in opposition to centrifugal force, by the stream of air created by the fan. Th s finely pulverized material passes with the airstream into the fan chamber 5| through the opening 63 and is delivered from the fan chamber through the nozzle If desired, the liner 56 may be mounted in the housing in such a manner as to provide a space 18 therebetween for the collection of tramp metal or other hard foreign bodies. The pocket formed by the space 18 may be connected with the lower end of the inlet passage 69 by means of the laterally extending opening I9.

From the foregoing description and the accompanying drawings. it should now be readily understood that we have provided a compact and efficient form of pulverizing machine, which embodies a plurality of pulverizing zones and wherein the rotors of the pulverizing zones are so arranged that the material to be crushed passes through the rotors in succession and passes through each rotor in opposition to centrifugal force. In the arrangement which we have provided, the passage of the material through each crushing zone in opposition to centrifugal force, results in the most eflicient and thorough pulverizing action being obtained in each zone, since only the finely pulverized particles can be withdrawn from the pulverizing zones by the air stream. By thus providing a pulverizing machine wherein the most eflicient pulverizing action obtainable is had in each pulverizing zone, we find that our invention may be embodied in a machine of relatively small size for a desired rate of output of pulverized material. Moreover, it .will be seen that since the pulverizing zones of our improved machine function with maximum efliciency, a given output of pulverized material can be obtained with a smaller expenditure of power than has heretoiore been possible in pulverizing machines.

While we have illustrated and described the pulverizing apparatus of our-invention in a detailed manner, it should be understood, however, that we do not wish to be limited to the precise details of construction and arrangement of parts illustrated and described, but regard our invention as including such changes and modifications as do not involve a departure from the spirit of the invention and the scope of the appended claim.

Having thus described our invention, we claim:

In a pulverizing machine the combination of a housing having an end wall and an inlet adjacent thereto, a partition spaced from said wall and having an opening therein, a rotor in close running relation to said partition and having an opening registering substantially with the partition opening, said rotor also having a plurality of circumferentially spaced axially extending crushing elements rotatable about the partition opening, a member mounted in said housing and having circumferentially spaced axially extending crushing elements for cooperation with the crushing elements of said rotor, said member also having a disk portion spaced from said end wall to provide a passage for feeding material from said inlet to said rotor, a second partition in said housing spaced from the first partition and having a discharge opening therein, said second partition having a plurality of axially extending crushing elements spaced around the opening therein, a second rotor adjacent said second partition and having circumferentially spaced axially extending crushing elements for cooperation with the crushing elements of the second partition, said second rotor also having a disk portion spaced from the first mentioned partition to provide a passage for feeding material to such second rotor, and means for causing a flow of air through the housing whereby the material. passes inwardly through the rotors in opposition to centrifugal force.

AUSTIN A. HOLBECK. HALVOR F. HOLBECK. 

